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# Fluid UI vs Proto.io Comparison - What are their main differences?

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Fluid UIProto.io[+ Add Product](#)

Reviews

**Fluid UI** [

4.1/5(22)

](https://www.g2.com/products/fluid-ui/reviews#reviews)

**Proto.io** [

4.1/5(68)

](https://www.g2.com/products/proto-io/reviews#reviews)

Pricing

**Fluid UI**
Free Trial

No pricing available

**Proto.io**
Free Trial

**Starting at $24.00** · Freelancer

**Pricing Insights**
from reviews

Time to Implement

**Fluid UI**
Not enough reviews yet

**Proto.io**
Not enough reviews yet

Return on Investment

**Fluid UI**
Not enough reviews yet

**Proto.io**
Not enough reviews yet

Perceived Cost

**Fluid UI**
$$$$$

**Proto.io**
$$$$$

Average Discount

**Fluid UI**
Not enough reviews yet

**Proto.io**
Not enough reviews yet

Pros & Cons

**Fluid UI**
Not enough data

**Proto.io**
[
Ease of Use (1)
](https://www.g2.com/products/proto-io/reviews?filters%5Bsentiment_snippet%5D=2326801&qs=pros-and-cons#reviews)[
Interactive Prototyping (1)
](https://www.g2.com/products/proto-io/reviews?filters%5Bsentiment_snippet%5D=2326839&qs=pros-and-cons#reviews)[
Complexity (1)
](https://www.g2.com/products/proto-io/reviews?filters%5Bsentiment_snippet%5D=2326847&qs=pros-and-cons#reviews)[
Expensive (1)
](https://www.g2.com/products/proto-io/reviews?filters%5Bsentiment_snippet%5D=2326859&qs=pros-and-cons#reviews)

Screenshots

**Fluid UI**
 ![Fluid UI screenshot](https://images.g2crowd.com/cdn-cgi/image/width=600,height=600,fit=scale-down,format=auto,onerror=redirect,/https://images.g2crowd.com/uploads/attachment/file/65732/expirable-direct-uploads_2F904ee0b6-19f2-4037-8e6f-b7593c874fd5_2Flo-fi-prototype.png)

**Proto.io**
 ![Proto.io screenshot](https://images.g2crowd.com/cdn-cgi/image/width=600,height=600,fit=scale-down,format=auto,onerror=redirect,/https://images.g2crowd.com/uploads/attachment/file/45197/expirable-direct-uploads_2F2090b8cc-9a6a-442f-9cd5-5b84b693e631_2FProto.io_Screen_Shot__.png)

Ratings

Meets Requirements

**Fluid UI**

8.2

8.221

**Proto.io**

8.3

8.362

Ease of Use

**Fluid UI**

9.0

9.021

**Proto.io**

8.1

8.162

Ease of Setup

**Fluid UI**

8.9

8.99

**Proto.io**

8.2

8.219

Ease of Admin

**Fluid UI**

8.5

8.59

**Proto.io**

7.7

7.718

Quality of Support

**Fluid UI**

8.6

8.617

**Proto.io**

7.9

7.949

Has the product been a good partner in doing business?

**Fluid UI**

8.8

8.88

**Proto.io**

7.3

7.313

Product Direction (% positive)

**Fluid UI**

8.3

8.320

**Proto.io**

7.6

7.662

Features

Prototyping[Hide 49 FeaturesShow 49 Features](javascript:void(0);)

Not enough data

8.8

7

Platform Basics

Modeling Tools

Not enough data

8.9(won by default)

6

Feedback and Communication

Not enough data

8.8(won by default)

7

Framework Libraries

Not enough data

8.6(won by default)

6

Editing Tools

Not enough data

8.6(won by default)

7

Collaboration Tools

Not enough data

Not enough data

Image Library

Not enough data

Not enough data

Platform Additional Functionality

Sharing Components

Not enough data

9.2(won by default)

6

Error Documentation

Not enough data

8.6(won by default)

6

User Interface Testing

Not enough data

8.9(won by default)

6

Presentation Integrations

Not enough data

9.0(won by default)

7

Third-Party Integrations

Not enough data

Not enough data

Performance Testing

Not enough data

Not enough data

Usability Testing

Not enough data

Not enough data

Agentic AI - Prototyping

Autonomous Task Execution

Not enough data

Not enough data

Multi-step Planning

Not enough data

Not enough data

Cross-system Integration

Not enough data

Not enough data

Natural Language Interaction

Not enough data

Not enough data

Proactive Assistance

Not enough data

Not enough data

Additional Functionality

Commenting/Notes

Not enough data

Not enough data

Project Management

Not enough data

Not enough data

Single Sign On

Not enough data

Not enough data

Generative AI

Not enough data

Not enough data

AI Copilot

Not enough data

Not enough data

Workflow Management

Not enough data

Not enough data

Offline Access

Not enough data

Not enough data

Ideation

Not enough data

Not enough data

Customizable Templates

Not enough data

Not enough data

Chat/Messaging

Not enough data

Not enough data

Real-Time Updates

Not enough data

Not enough data

Design Management

Not enough data

Not enough data

API

Not enough data

Not enough data

Mockup Creation

Not enough data

Not enough data

Feedback Management

Not enough data

Not enough data

Drag & Drop

Not enough data

Not enough data

UI Prototyping

Not enough data

Not enough data

Software Prototyping

Not enough data

Not enough data

Multiple Projects

Not enough data

Not enough data

Mobile Access

Not enough data

Not enough data

Activity Dashboard

Not enough data

Not enough data

Agile Methodologies

Not enough data

Not enough data

Whiteboard

Not enough data

Not enough data

Wireframe Creation

Not enough data

Not enough data

User Management

Not enough data

Not enough data

Animation

Not enough data

Not enough data

Version Control

Not enough data

Not enough data

Data Import/Export

Not enough data

Not enough data

UX Prototyping

Not enough data

Not enough data

Widgets

Not enough data

Not enough data

Interactive Elements

Not enough data

Not enough data

User Insights

Reviewers' Company Size

[![Fluid UI](https://images.g2crowd.com/uploads/product/hd_favicon/1500551861/fluid-ui.svg "Fluid UI")](https://www.g2.com/products/fluid-ui/reviews)

Fluid UI

Small-Business(50 or fewer emp.)

59.1%

Mid-Market(51-1000 emp.)

36.4%

Enterprise(\> 1000 emp.)

4.5%

[![Proto.io](https://images.g2crowd.com/uploads/product/hd_favicon/1487566699/proto-io.svg "Proto.io")](https://www.g2.com/products/proto-io/reviews)

Proto.io

Small-Business(50 or fewer emp.)

53.1%

Mid-Market(51-1000 emp.)

28.1%

Enterprise(\> 1000 emp.)

18.8%

Small-Business

(50 or fewer emp.)

59.1%

53.1%

Mid-Market

(51-1000 emp.)

36.4%

28.1%

Enterprise

(\> 1000 emp.)

4.5%

18.8%

Reviewers' Industry

[![Fluid UI](https://images.g2crowd.com/uploads/product/hd_favicon/1500551861/fluid-ui.svg "Fluid UI")](https://www.g2.com/products/fluid-ui/reviews)
Fluid UI

Information Technology and Services

18.2%

Computer Software

18.2%

Design

13.6%

Wireless

4.5%

Leisure, Travel & Tourism

4.5%

Other

40.9%

[![Proto.io](https://images.g2crowd.com/uploads/product/hd_favicon/1487566699/proto-io.svg "Proto.io")](https://www.g2.com/products/proto-io/reviews)
Proto.io

Information Technology and Services

28.1%

Computer Software

12.5%

Design

9.4%

Marketing and Advertising

6.3%

Leisure, Travel & Tourism

4.7%

Other

39.1%

FAQs

## Fluid UI vs Proto.io FAQs

Generated using AI

Last updated: August 15, 2026

### What is the difference between Fluid UI vs Proto.io?

Fluid UI and Proto.io are rated equally by G2 reviewers, but Fluid UI stands out for its higher Ease of Setup and Quality of Support scores, while Proto.io is noted for its interactive prototyping capabilities.

| [Fluid UI](https://www.g2.com/products/fluid-ui/reviews) | [Proto.io](https://www.g2.com/products/proto-io/reviews) |
| --- | --- |
| 4.1/5 (22 reviews) | 4.1/5 (68 reviews) |
| 8.9 | 8.2 |
| 8.6 | 7.9 |
| Easy to design wireframes and showcase to stakeholders | Interactive prototyping and team collaboration |

### How do the pricing models of Fluid UI and Proto.io compare?

Fluid UI is rated higher for Price/Cost satisfaction than Proto.io, indicating reviewers consider Fluid UI the stronger value.

- **Fluid UI:** In recent reviews, several reviewers mention Fluid UI as affordable and easy to use, though some note it can be "a little expensive" for smaller businesses.
- **Proto.io:** Reviewers frequently cite Proto.io's pricing as expensive and mention a desire for more flexible pricing, especially for individuals and freelancers.

### What are the best alternatives to Fluid UI and Proto.io?

Figma, InVision, and Sketch are the top three alternatives to Fluid UI and Proto.io according to G2 rankings.

| Product | G2 Rating (reviews) | Largest Segment | Pricing Insight | Top Reviewer-Cited Strength |
| --- | --- | --- | --- | --- |
| [Fluid UI](https://www.g2.com/products/fluid-ui/reviews) | 4.1/5 (22) | — | Affordable and easy to use | Easy to design wireframes and showcase to stakeholders |
| [Proto.io](https://www.g2.com/products/proto-io/reviews) | 4.1/5 (68) | — | Pricing cited as expensive | Interactive prototyping and team collaboration |
| [Figma](https://www.g2.com/products/figma/reviews) | 4.7/5 (1583) | Small-Business | — | — |
| [InVision](https://www.g2.com/products/invision/reviews) | 4.4/5 (684) | Small-Business | — | — |
| [Sketch](https://www.g2.com/products/sketch/reviews) | 4.5/5 (1226) | Small-Business | — | — |

### Which Wireframing features should I prioritize when comparing Fluid UI and Proto.io?

Buyers comparing Fluid UI and Proto.io should prioritize Ease of Use, Ease of Setup, Quality of Support, Interactive Prototyping, and Team Collaboration.

- **Ease of Use:** Fluid UI scores 9.0, Proto.io scores 8.1.
- **Ease of Setup:** Fluid UI scores 8.9, Proto.io scores 8.2.
- **Quality of Support:** Fluid UI scores 8.6, Proto.io scores 7.9.
- **Interactive Prototyping:** Proto.io is specifically cited for interactive prototyping (all-time mentions: 1).
- **Team Collaboration:** Proto.io is cited for team collaboration (all-time mentions: 1).

### What are the pros and cons of Fluid UI vs Proto.io?

Fluid UI's headline strength is ease of setup and use, while Proto.io's is interactive prototyping and team collaboration.

- **Fluid UI strengths:** Easy to design wireframes and showcase to stakeholders; affordable and easy to use; fast UI and wireframe tool with great interaction functions.
- **Fluid UI trade-offs:** Limited features in the trial version; some reviewers mention it can be expensive for smaller businesses; lacks advanced features for high-fidelity mockups.
- **Proto.io strengths:** Interactive prototyping (all-time mentions: 1); team collaboration (all-time mentions: 1); time-saving (all-time mentions: 1); easy to use for both designers and non-designers.
- **Proto.io trade-offs:** Complexity (all-time mentions: 1); expensive (all-time mentions: 1); slow loading (all-time mentions: 1); limited offline mode and some performance issues with large projects.

### Is Fluid UI or Proto.io better for small businesses?

Fluid UI is the better fit for small businesses based on reviewer sentiment and affordability mentions.

- **Fluid UI:** Reviewers highlight affordability and ease of use, with several noting its suitability for small businesses and freelancers.
- **Proto.io:** Reviewers frequently mention pricing as a concern for individuals and small teams, with some citing the need for more flexible options.

### Which Wireframing platform has better integrations?

Fluid UI and Proto.io are at parity for integrations, as no recent reviews cite specific third-party integrations for either product.

- **Fluid UI:** No reviewer-cited integrations in recent reviews.
- **Proto.io:** No reviewer-cited integrations in recent reviews.

### How do Fluid UI and Proto.io compare on customer support?

Fluid UI has a higher Quality of Support score than Proto.io by 0.7 points, a material difference in reviewer satisfaction.

- **Fluid UI:** Reviewers consistently rate support highly, with multiple mentions of helpful documentation and responsive assistance.
- **Proto.io:** Reviewers describe support as generally positive, though some note slower response times and less flexibility compared to expectations.

### Which is easier to implement, Fluid UI or Proto.io?

Fluid UI is easier to implement than Proto.io, with a 0.7-point higher Ease of Setup score.

- **Fluid UI:** Reviewers describe setup as quick and straightforward, with scores up to 7.0 and frequent mentions of an easy learning curve.
- **Proto.io:** Reviewers note a generally easy setup process, but some mention a steeper learning curve for advanced features and occasional complexity.

Alternatives

**Fluid UI Alternatives**

 ![InVision](https://images.g2crowd.com/uploads/product/hd_favicon/1487565766/invision.svg "InVision")

[
InVision
](/products/invision/reviews)

 ![Figma](https://images.g2crowd.com/uploads/product/image/thumb_square/thumb_square_3f8dfbd36c438447b2cb20b9565f2afd/figma.jpg "Figma")

[
Figma
](/products/figma/reviews)

 ![Marvel](https://images.g2crowd.com/uploads/product/hd_favicon/1487566721/marvel.svg "Marvel")

[
Marvel
](/products/marvel/reviews)

 ![Balsamiq](https://images.g2crowd.com/uploads/product/image/thumb_square/thumb_square_5954886973ef396efdaf1296f912ff00/balsamiq.jpg "Balsamiq")

[
Balsamiq
](/products/balsamiq/reviews)

**Proto.io Alternatives**

 ![Figma](https://images.g2crowd.com/uploads/product/image/thumb_square/thumb_square_3f8dfbd36c438447b2cb20b9565f2afd/figma.jpg "Figma")

[
Figma
](/products/figma/reviews)

 ![Sketch](https://images.g2crowd.com/uploads/product/hd_favicon/7b02ee76c23f8819c327aac6a9f832e8/sketch.svg "Sketch")

[
Sketch
](/products/sketch/reviews)

 ![Adobe XD](https://images.g2crowd.com/uploads/product/hd_favicon/0bebab9bb1c4547c2407d1f73900c8a7/adobe-xd.svg "Adobe XD")

[
Adobe XD
](/products/adobe-xd/reviews)

 ![InVision](https://images.g2crowd.com/uploads/product/hd_favicon/1487565766/invision.svg "InVision")

[
InVision
](/products/invision/reviews)

## Fluid UI vs Proto.io

When assessing the two solutions, reviewers found Fluid UI easier to use, set up, and administer. Reviewers also preferred doing business with Fluid UI overall.

- Reviewers felt that Proto.io meets the needs of their business better than Fluid UI.
- When comparing quality of ongoing product support, reviewers felt that Fluid UI is the preferred option.
- For feature updates and roadmaps, our reviewers preferred the direction of Fluid UI over Proto.io.